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COMMITMENTS AND CONTINGENCIES - Lease payments (Details)
$ in Thousands
12 Months Ended
Feb. 21, 2018
USD ($)
ft²
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
COMMITMENTS AND CONTINGENCIES      
Rent expense   $ 1,376 $ 1,271
Lease term 10 years    
Area of land | ft² 77,000    
Monthly rentals payable $ 43    
Operating Leases      
2019   1,024  
2020   858  
2021   722  
2022   726  
2023   738  
Thereafter   3,380  
Total   $ 7,448